im on a 500w Powersupply which is the minimum requirement for the card

I have a 6+2 pin connector which branches off of another 6 pin connector which runs off one line from the PSU. Could i use both plugs even though they are off the same PSU run or is a one or the other type of deal?

Would it be better for me to buy a new PSU with a dedicated 6 pin and 8 pin with a line for each off the psu or can i use my existing PSU?